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Dark-Matter Content of Early-Type Galaxies with Planetary Nebulae

Date

2008

Authors

Napolitano, N. R.
Romanowsky, A. J.
Coccato, L
Capaccioli, M
Douglas, Nigel G
Noordermeer, E
Merrifield, M R
Kuijken, Konrad
Arnaboldi, Magda
Gerhard, Ortwin

Journal Title

Journal ISSN

Volume Title

Publisher

Cambridge University Press

Abstract

We examine the dark matter properties of nearby early-type galaxies using planetary nebulae (PNe) as mass probes. We have designed a specialised instrument, the Planetary Nebula Spectrograph (PN.S) operating at the William Herschel telescope, with the purpose of measuring PN velocities with best efficiency. The primary scientific objective of this custom-built instrument is the study of the PN kinematics in 12 ordinary round galaxies. Preliminary results showing a dearth of dark matter in ordinary galaxies (Romanowsky et al. 2003) are now confirmed by the first complete PN.S datasets. On the other hand early-type galaxies with a regular dark matter content are starting to be observed among the brighter PN.S target sample, thus confirming a correlation between the global dark-to-luminous mass virial ratio (fDM = MDM M*) and the galaxy luminosity and mass.

Description

Keywords

Keywords: Dark matter; Evolution; Galaxies: haloes; Kinematics and dynamics

Citation

Source

Dark Galaxies and Lost Baryons

Type

Conference paper

Book Title

Entity type

Access Statement

License Rights

DOI

10.1017/S1743921307014111

Restricted until

2037-12-31